Keep your dirty motor oil and spray it on the bottom for some cheap protection from the salt, install a block heater that's at least 600-700W+, and maybe an inline one too, and lastly go to a j-yard and get two of the newest/largest side post batteries you can and run 'em in parallel for plenty cranking on the colder days. IMO all that should keep you running and minimize any rust problems for ~$100.
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